Hubungan Dimensi dan Tipe Partisipasi Petani Cabai pada Kegiatan Fungsi Pemasaran di Titik Kumpul Pakem Kabupaten Sleman Indonesia: Relationship between Dimensions and Types of Chili Farmer Participation in Marketing Function Activities at Pakem Gathering Point, Sleman Regency, Indonesia (Agribusiness Department, Faculty of Agriculture, UPN)